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UPSC Civil services Entrance exams General Studies test # General Science Mineral Nutrition Prepare / Learn

Q1. Grey spots of Oat are due to deficiency of

A. Iron (Fe)

B. Copper (Cu)

C. Manganese (Mn)

D. Zinc (Zn)

Answer : Option C
Explaination / Solution:

Manganese deficiency in Oat appear as grey spots on leaves of oat. Rate of photosynthesis is also influenced by the Manganese elements.

UPSC Civil services Entrance exams General Studies test # General Science Digestion and Absorption Prepare / Learn

Q2. All are digestive glands except :

A. Thyroid gland

B. Liver

C. Pancreas

D. Salivary gland

Answer : Option A
Explaination / Solution:

Liver, pancrease and salivary gland are digestive gland that release enzymes for digestion of food but thyroid gland release thyroxin hormone that help in metabolism of carbohydrates, proteins and fats.

UPSC Civil services Entrance exams General Studies test # General Science Classification of Elements and Periodicity in Properties Prepare / Learn

Q3. Which one of the following molecules represents the increasing order of bond length ?

A. F2 < Cl2 < O2 < N2

B. Cl2 < O2 < N2 < F2

C. N2 < O2 < F2< Cl2

D. F2 < N2 < Cl2< O2

Answer : Option C
Explaination / Solution:

The bond lengths depend upon the number and type of bonds present in a molecule . Greater the number of bonds shorter would be the bond length.

Thus , the given molecules are all diatomic molecules where ,

(i) $N_{2}$ has the smallest bond length as it is triple bonded.

(ii) $O_{2}$ is double bonded so its bond length is greater than $N_{2}$ .

(iii) $F_{2} a n d C l_{2}$ both , though single bonded , the bond length of $C l_{2}$ is greater than that of $F_{2}$ due to its larger atomic size.

Hence , the correct increasing order of given molecules is $N_{2} < O_{2} < F_{2} < C l_{2}$

UPSC Civil services Entrance exams General Studies test # General Science Ray Optics and Optical Instruments Prepare / Learn

Q4. An equi-convex crown glass lens has a focal length 20 cm for violet rays. Its focal length for red rays is

μ_{v} = 1.5 & μ_{r} = 1.47

A. 20.82 cm

B. 24.85 cm

C. 22.85 cm

D. 21.28 cm

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Human Health and Disease Prepare / Learn

Q5. Which one of the following is a bridge linking childhood and adulthood?

A. Adolescence

B. Young age

C. Puberty

D. Adulthood

Answer : Option A
Explaination / Solution:

Adolescence is a bridge linking childhood and adulthood. It is accompanied by several biological and behavioral changes. Thus, it is a very vulnerable phase of mental and psychological development.

UPSC Civil services Entrance exams General Studies test # General Science Introduction to Economics Prepare / Learn

Q6. Larger production of ___________ goods would lead to higher production in the future.

A. Nuclear Power

B. Electricity

C. Capital

D. Coal

Answer : Option C
Explaination / Solution:

A capital good is a durable good that is used in the production of goods or services. Capital goods are one of the three types of producer goods, the other two being land and labour which are also known collectively as primary factors of production.

UPSC Civil services Entrance exams General Studies test # General Science Neural Control and Coordination Prepare / Learn

Q7. The choroid layer in human eye :

i. darkens the cavity of eyeball to prevent internal reflection of light.
ii. its blood vessels nourish the retina.
iii. it regulates shape of eye lens.

A. only i) and ii) are correct.

B. all statements are correct.

C. onlyi) and iii) are correct.

D. only ii) is correct.

Answer : Option A
Explaination / Solution:

The choroid layer in human eye darkens the cavity of eyeball to prevent internal reflection of light. The blood vessels of choroid layer nourish the retina. The shape of eye lens is changed by ciliary muscles.

UPSC Civil services Entrance exams General Studies test # General Science Producer Behaviour and Supply Prepare / Learn

Q8. The relationships between AR and MR is when price falls is

A. Both rise in sales

B. AR falls but MR rises

C. Both decline with sales

D. AR rises but MR falls

Answer : Option C
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Thermal Properties of Matter Prepare / Learn

Q9.

A large steel wheel is to be fitted on to a shaft of the same material. At 27 $^{\circ}$ C, the outer diameter of the shaft is 8.70 cm and the diameter of the central hole in the wheel is 8.69 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip on the shaft? Assume coefficient of linear expansion of the steel to be constant over the required temperature range: $α_{s t e e l}$ = 1.20 $\times$ $1 0^{- 5}$ $K^{- 1}$